Are you the guy, Mark, I spoke with the other day? Assuming you are, you forgot to mention for everyone that it is a 4" stroke combo. With the 4" stroke, pistons .005" out of the hole, a GM MLS gasket or Cometic .051" gasket, and 64cc 243 heads, you'll net right at 10.9:1 static compression. That extra stroke makes a LARGE difference in how much relief/dish you have to run to get back to OE compression. You're good to go

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